Checking the G t setting: Calibrating a Truck Refer to "Checking the Gain" and "Adjusting the Gain" for display and adjustment information. This procedure causes the PLM ΙΙ to calculate a new empty ’tare’(calibration) weight (refer to "Viewing Pay- load Calculation Inputs) for use with all subsequent payload estimates. Before calibrating, confirm the truck nose up produces a positive incline. Checking the Inclinometer Settings Refer to "Viewing Payload Calculation Inputs" for in- structions on displaying truck pitch angle. With an empty truck on level ground and suspensions properly charged, the display should indicate 0.0 ± 1.0. Re- member, this is not a live display.
After adjustment, Service Check Mode must be entered again to obtain a new reading. The payload meter should be calibrated whenever one of the following occurs: 1. When a new payload meter is installed. 2. When a suspension sensor has been changed. 3. Whenever the suspensions have been serviced or the Nitrogen levels have changed. An alternative method is to use a personal computer running the Komatsu Payload Download Program for Microsoft Windows. The "Monitor Pressures" section of the program displays live inclinometer data. The inclinometer can be loosened and adjusted until the live display shows 0.0 ± 1.0 degrees with an empty truck on level ground, and the suspensions properly charged.
4. Whenever any major change to the truck has been performed that would change the empty vehicle weight. 5. Once a month thereafter. Another method is to use a voltmeter to read the voltage output of the inclinometer. With an empty truck on level ground, and the suspensions properly charged, the output voltage should be 2.6 ± .1 volts. To calibrate the payload meter: 1. With the engine running and the truck stopped, press and hold the CAL/CLR switch until "CAL" is flashing on the display. 2. Drive the truck until the speed is approximately 20-10 MPH (10-15 Km/H) 3. Press the CAL/CLR switch once. 4. Drive until the display switches back to the time of day. This will take up to 30 seconds.
Carry out this operation on flat level ground. Travel in a straight line. Maintain a steady speed, 20-10 MPH (10-15 Km/H) 5. The payload meter is now calibrated and ready for normal operation. M20007.1 03/02 Payload Meter II M20-17